Bump to OVN 24.03 LTS (#1448)

diff --git a/images/magnum/Dockerfile b/images/magnum/Dockerfile
index d7f5246..1ad87da 100644
--- a/images/magnum/Dockerfile
+++ b/images/magnum/Dockerfile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
-# Atmosphere-Rebuild-Time: 2024-05-30T20:29:01Z
+# Atmosphere-Rebuild-Time: 2024-06-25T22:49:25Z
 
 ARG RELEASE